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iOS阶段学习第31天笔记(UINavigationBar介绍)

作者:佚名      IOS开发编辑:admin      更新时间:2022-07-23

iOS学习(UI)知识点整理

 

一、UINavigationBar 的介绍 

1)概念:UINavigationBar 是用于定义导航栏按钮的一个类对象 

2)在使用UINavigationBar之前必须先初始化导航栏 实例代码:

 1 //初始化导航栏
 2 FirstViewController *firstVC = [[FirstViewController alloc] init];
 3 UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:firstVC];
 4 self.window.rootViewController = nav;
 5 
 6 //appearance一定要在初始化之前使用
 7 //修改默认的UINavigationBar的导航条背景颜色,
 8 [[UINavigationBar appearance] setBarTintColor:[UIColor yellowColor]];
 9 
10 //修改默认的导航栏文字即图标颜色
11 [[UINavigationBar appearance] setTintColor:[UIColor blackColor]];
12     
13 //设置导航栏背景图片
14 [[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"icon"]   forBarMetrics:UIBarMetricsDefault];

 3)setNavigationBarHidden 设置隐藏导航栏  例如: 

1 [self.navigationController setNavigationBarHidden:YES];

 4)title 设置导航栏标题  例如: 

1 self.title = @“First View”;
2 //注意:在一处做此设置后,后面的视图控制器如未作设置也会使用此标题

 5)titleView 用于设置导航栏中间的视图 例如: 

 1    UIView *navBarView = [[UIView alloc] init];
 2     navBarView.frame = CGRectMake(0, 0, 100, 30);
 3     navBarView.backgroundColor = [UIColor clearColor];
 4     navBarView.layer.cornerRadius = 8.0f;
 5     navBarView.clipsToBounds = YES;
 6     
 7     UIButton *btn1 = [[UIButton alloc] init];
 8     btn1.frame = CGRectMake(0, 0, 50, 30);
 9     btn1.backgroundColor = [UIColor blueColor];
10     [btn1 setTitle:@"消息" forState:UIControlStateNormal];
11     [btn1 addTarget:self action:@selector(btn1Tapped:)  forControlEvents:UIControlEventTouchUpInside];
12     btn1.tag = 1000;
13     [navBarView addSubview:btn1];
14     
15     UIButton *btn2 = [[UIButton alloc] init];
16     btn2.frame = CGRectMake(50, 0, 50, 30);
17     btn2.backgroundColor = [UIColor blueColor];
18     [btn2 setTitle:@"电话" forState:UIControlStateNormal];
19     [btn2 addTarget:self action:@selector(btn1Tapped:) forControlEvents:UIControlEventTouchUpInside];
20     btn2.tag = 1001;
21     [navBarView addSubview:btn2];
22 
23     //在导航栏中的中间位置加入我们自定义的view,
24     //程序会把我们设置的view自动居中
25     self.navigationItem.titleView = navBarView;

 

6)UIBarButtonItem 导航栏上的按钮元素  常用的系统自带的Bar有 

/*
* UIBarButtonSystemItemDone  按钮样式为文字Done、
* UIBarButtonSystemItemAdd 按钮样式为图片的加号
*UIBarButtonSystemItemCamera 按钮样式是图片的照相机
     
*UIBarButtonSystemItemFixedSpace 是一个占位符 ,可以设置width
*UIBarButtonSystemItemFlexibleSpace 是一个占位符,固定宽度,导航栏上单独一个按钮
*/

例如:

1 //系统自带照相机按钮
2 UIBarButtonItem *button1 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera
target:self action:@selector(barButtonTapped:)]; 3 4 //占位符按钮 5 UIBarButtonItem *button2 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
target:self action:@selector(barButtonTapped:)];

 

7)rightBarButtonItem 设置导航栏右侧单个按钮 例如:

1 self.navigationItem.rightBarButtonItem = button1;

 

8)rightBarButtonItems 设置导航栏右侧多个按钮 例如:

1 self.navigationItem.rightBarButtonItems = @[button2, button1];

 

9)edgesForExtendedLayout 设置view的坐标都是从导航栏左下点开始计算 防止导航栏遮挡内容区域
例如:

1 self.edgesForExtendedLayout = UIRectEdgeNone;

 

10)initWithTitle 使用文字作为导航栏按钮 例如:

1 UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain
target:self action:@selector(back)];

 

11)initWithImage 使用图片作为导航栏按钮 例如:

1 UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"st_logout"] 
style:UIBarButtonItemStylePlain target:self action:@selector(back)]; 2 self.navigationItem.leftBarButtonItem = barButtonItem;

12)setToolbarHidden 设置导航栏显示与隐藏 例如: 

1  [self.navigationController setToolbarHidden:NO];

 

13)动画效果实现 代码:

 1 - (void)viewDidLoad {
 2     [super viewDidLoad];
 3     self.view.backgroundColor=[UIColor whiteColor]; 
 4 
 5     firstView=[[UIView alloc]init];
 6     firstView.frame=CGRectMake(0, 20, 50, 50);
 7     firstView.backgroundColor=[UIColor blackColor];
 8     [self.view addSubview:firstView]; 
 9     for (int i=0; i<4; i++) { 
10         UIButton *btn=[[UIButton alloc]init]; 
11         btn.frame=CGRectMake(20,50, CGRectGetWidth(self.view.frame), 30); 
12     } 
13     [self moveFirstViewToRight];
14 }
15 
16 -(void)moveFirstViewToRight{ 
17     //UIview 动画
18     [UIView animateWithDuration:3.f animations:^{
19         firstView.frame=CGRectMake(self.view.frame.size.width-firstView.frame.size.width, 20, 50, 50);
20     }];
21 }